| Code | Display | Definition | V2 Concept Comment | V2 Concept Comment As Published | V2 Concept Comment | V2 Concept Comment As Published |
| OBR-OBX | OBX segment following an OBR segment | OBX segment following an OBR segment | For responses related to the test order, For responses related to the test order | For responses related to the test order, For responses related to the test order | For responses related to the test order, For responses related to the test order | For responses related to the test order, For responses related to the test order |
| SPM-OBX | OBX segment following an SPM segment | OBX segment following an SPM segment | For responses related to the specimen, For responses related to the specimen | For responses related to the specimen, For responses related to the specimen | For responses related to the specimen, For responses related to the specimen | For responses related to the specimen, For responses related to the specimen |
| DG1-3 | Diagnosis Code | Diagnosis Code | | | | |
| NK1-11 | Next of Kin / Associated Parties Job Code/Class | Next of Kin / Associated Parties Job Code/Class | Used to convey patient's or next of kin's employment job class code, Used to convey patient's or next of kin's employment job class code | Used to convey patient's or next of kin's employment job class code, Used to convey patient's or next of kin's employment job class code | Used to convey patient's or next of kin's employment job class code, Used to convey patient's or next of kin's employment job class code | Used to convey patient's or next of kin's employment job class code, Used to convey patient's or next of kin's employment job class code |
| NK1-13 | Organization Name - NK1 | Organization Name - NK1 | Next of kin's organization name, Next of kin's organization name | Next of kin's organization name, Next of kin's organization name | Next of kin's organization name, Next of kin's organization name | Next of kin's organization name, Next of kin's organization name |
| NK1-28 | Ethnic Group | Ethnic Group | Next of kin's ethnicity, Next of kin's ethnicity | Next of kin's ethnicity, Next of kin's ethnicity | Next of kin's ethnicity, Next of kin's ethnicity | Next of kin's ethnicity, Next of kin's ethnicity |
| NK1-35 | Race | Race | Next of kin's race, Next of kin's race | Next of kin's race, Next of kin's race | Next of kin's race, Next of kin's race | Next of kin's race, Next of kin's race |
| OBR-16 | Ordering Provider | Ordering Provider | | | | |
| OBR-13 | Relevant Clinical Information | Relevant Clinical Information | The purpose varies based on the AOE referencing this field., The purpose varies based on the AOE referencing this field. | The purpose varies based on the AOE referencing this field., The purpose varies based on the AOE referencing this field. | The purpose varies based on the AOE referencing this field., The purpose varies based on the AOE referencing this field. | The purpose varies based on the AOE referencing this field., The purpose varies based on the AOE referencing this field. |
| OBR-49 | Result Handling | Result Handling | This was used for call or fax results back, This was used for call or fax results back | This was used for call or fax results back, This was used for call or fax results back | This was used for call or fax results back, This was used for call or fax results back | This was used for call or fax results back, This was used for call or fax results back |
| PID-11 | Patient Address | Patient Address | Applies to patient, Applies to patient | Applies to patient, Applies to patient | Applies to patient, Applies to patient | Applies to patient, Applies to patient |
| PID-3 | Patient Identifier List | Patient Identifier List | Applies to patient, Applies to patient | Applies to patient, Applies to patient | Applies to patient, Applies to patient | Applies to patient, Applies to patient |
| PID-5 | Patient Name | Patient Name | Applies to patient, Applies to patient | Applies to patient, Applies to patient | Applies to patient, Applies to patient | Applies to patient, Applies to patient |
| PID-6 | Mother's Maiden Name | Mother's Maiden Name | Applies to patient, Applies to patient | Applies to patient, Applies to patient | Applies to patient, Applies to patient | Applies to patient, Applies to patient |
| PID-7 | Date/Time of Birth | Date/Time of Birth | Applies to patient, Applies to patient | Applies to patient, Applies to patient | Applies to patient, Applies to patient | Applies to patient, Applies to patient |
| PID-13 | Phone Number - Home | Phone Number - Home | deprecated field as of v2.7, deprecated field as of v2.7 | deprecated field as of v2.7, deprecated field as of v2.7 | deprecated field as of v2.7, deprecated field as of v2.7 | deprecated field as of v2.7, deprecated field as of v2.7 |
| PID-14 | Phone Number - Business | Phone Number - Business | deprecated field as of v2.7, deprecated field as of v2.7 | deprecated field as of v2.7, deprecated field as of v2.7 | deprecated field as of v2.7, deprecated field as of v2.7 | deprecated field as of v2.7, deprecated field as of v2.7 |
| PID-40 | Phone Number | Phone Number | New field in V2.7, New field in V2.7 | New field in V2.7, New field in V2.7 | New field in V2.7, New field in V2.7 | New field in V2.7, New field in V2.7 |
| PRT-5 | Participation Person | Participation Person | | | | |
| SPM-4 | Specimen Type | Specimen Type | | | | |
| SPM-8 | Specimen Source Site | Specimen Source Site | | | | |